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diff --git a/src/main/scala/sims/dynamics/Constraint.scala b/src/main/scala/sims/dynamics/Constraint.scala
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+++ b/src/main/scala/sims/dynamics/Constraint.scala
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+/*
+ * Simple Mechanics Simulator (SiMS)
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package sims.dynamics
+
+/**All constraints in SiMS implement this trait.
+ * Position and velocity can be corrected for each constraint.
+ * The implementation of constraints was inspired by Erin Catto's box2d.*/
+trait Constraint {
+  
+  /**Corrects the velocities of bodies according to this constraint.
+   * @param h a time interval, used for converting forces and impulses*/
+  def correctVelocity(h: Double): Unit
+  
+  /**Corrects the positions of bodies according to this constraint.
+   * @param h a time interval, used for converting forces and impulses*/
+  def correctPosition(h: Double): Unit
+}